Several database aliases can be open at the same time, but one alias is said to be the primary alias. This is the
default alias for all database operations except creating and opening a database. with the exceptions <MvCREATE> and <MvOPEN>,
if the NAME attribute is not specified by a database tag, that tag's action will be performed on the database pointed to
by the primary alias. By default, the primary alias is the last open to be opened with <MvOPEN> or <MvCREATE>. If more
than one alias is open, <MvPRIMARY> makes the NAME alias the primary one.

Attributes

NAME: Required. Database alias. Explicitly declares this alias to be the primary database.

INDEX: Optional. Index file name. Explicitly declares this file alias to be the primary index for the primary
database.

The alias database must currently be open or a runtime error will occur.